High-Strength Fasteners factory  can treat the Surface through some method to form the surface layer to cover on the surface, the purpose is attached to the surface of the beautiful, anti-corrosion products effect, surface treatment methods are attributed to the following methods:

      1、Electroplating: High-Strength Fasteners factory will accept the electroplating, to be baptized with sedimentary metal compounds in aqueous solution to current through the solution, High-Strength Fasteners factory makes the electroplating metal exhalation and deposition in the parts. Common electroplating is galvanization, copper, nickel, chromium, nickel and copper alloy, sometimes boiled black, the including phosphating, etc.

      2、Galvanized: through carbon steel parts submerged about 510 ℃ temperature of zinc plating melting slot completed. The result is steel parts on the surface of the iron, High-Strength Fasteners factory  makes zinc alloy become a product on the appearance of the passivation zinc. Hot dip aluminized is a similar process.

      3、Mechanical plating: through the metal coating particles to impact the product surface coating, and High-Strength Fasteners factory will be on the surface of the product to cold welding. General screws used more electroplating way, but some used in electric power, expressway and other outdoor hex wood screws, etc with hot-dip zinc; The average cost per kilogram electroplating for 0.6-0.8 yuan, hot-dip zinc is commonly 1.5-2 yuan/kg, High-Strength Fasteners factory  think the cost is higher.

      4、Hydrogen brittleness: fasteners in processing and handling of process, especially in the pickling and alkaline cleaning before plating and subsequently in the electroplating process, surface absorbed hydrogen atoms, deposition of the metal coating and then captured hydrogen. When tighten fasteners, toward the greatest concentration of hydrogen stress of enough, High-Strength Fasteners factory cause pressure turn to more than the strength of the metal matrix and produce tiny surface rupture. Hydrogen special activities and soon penetrated into the new form of fracture. This pressure-broken into circulation has been to continue-to fasteners fracture. High-Strength Fasteners factory Usually occurs in the first stress within several hours of application. In order to eliminate the threat of hydrogen brittleness, fasteners in after the plating as quickly as possible, in order to make hydrogen baking heat from the coating, baking in 375-4000 F usually (176 190 ℃) 3-24 hours. Due to mechanical galvanized is the electrolyte, High-Strength Fasteners factory actually eliminate the threat of hydrogen brittleness.